1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * arch/sh/kernel/cpu/sh2/probe.c 4 * 5 * CPU Subtype Probing for SH-2. 6 * 7 * Copyright (C) 2002 Paul Mundt 8 */ 9 #include <linux/init.h> 10 #include <linux/of_fdt.h> 11 #include <linux/smp.h> 12 #include <linux/io.h> 13 #include <asm/processor.h> 14 #include <asm/cache.h> 15 16 #if defined(CONFIG_CPU_J2) 17 extern u32 __iomem *j2_ccr_base; 18 static int __init scan_cache(unsigned long node, const char *uname, 19 int depth, void *data) 20 { 21 if (!of_flat_dt_is_compatible(node, "jcore,cache")) 22 return 0; 23 24 j2_ccr_base = (u32 __iomem *)of_flat_dt_translate_address(node); 25 26 return 1; 27 } 28 #endif 29 30 void __ref cpu_probe(void) 31 { 32 #if defined(CONFIG_CPU_SUBTYPE_SH7619) 33 boot_cpu_data.type = CPU_SH7619; 34 boot_cpu_data.dcache.ways = 4; 35 boot_cpu_data.dcache.way_incr = (1<<12); 36 boot_cpu_data.dcache.sets = 256; 37 boot_cpu_data.dcache.entry_shift = 4; 38 boot_cpu_data.dcache.linesz = L1_CACHE_BYTES; 39 boot_cpu_data.dcache.flags = 0; 40 #endif 41 42 #if defined(CONFIG_CPU_J2) 43 #if defined(CONFIG_SMP) 44 unsigned cpu = hard_smp_processor_id(); 45 #else 46 unsigned cpu = 0; 47 #endif 48 if (cpu == 0) of_scan_flat_dt(scan_cache, NULL); 49 if (j2_ccr_base) __raw_writel(0x80000303, j2_ccr_base + 4*cpu); 50 if (cpu != 0) return; 51 boot_cpu_data.type = CPU_J2; 52 53 /* These defaults are appropriate for the original/current 54 * J2 cache. Once there is a proper framework for getting cache 55 * info from device tree, we should switch to that. */ 56 boot_cpu_data.dcache.ways = 1; 57 boot_cpu_data.dcache.sets = 256; 58 boot_cpu_data.dcache.entry_shift = 5; 59 boot_cpu_data.dcache.linesz = 32; 60 boot_cpu_data.dcache.flags = 0; 61 62 boot_cpu_data.flags |= CPU_HAS_CAS_L; 63 #else 64 /* 65 * SH-2 doesn't have separate caches 66 */ 67 boot_cpu_data.dcache.flags |= SH_CACHE_COMBINED; 68 #endif 69 boot_cpu_data.icache = boot_cpu_data.dcache; 70 boot_cpu_data.family = CPU_FAMILY_SH2; 71 } 72